Answer:
C. 15
Step-by-step explanation:
The team has won ...
0.80 × 15 = 12 . . . games
To finish the season with a 90% winning percentage, they must win a total of ...
0.90 × 30 = 27 . . . games
That is, they must win ...
27 -12 = 15 . . . more games
The team must win 15 more games to finish with a 90% win rate.
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<em>Additional comment</em>
That means they must win every game of the last 15 played.
Answer:
z = 2.75
Step-by-step explanation:
The formula used for z-score is:
where, is the population mean
is the standard deviation
and x is the value of observation.
Here, x = 135, = 102 and, = 12
Putting all these values in formula of z-score. We get,
⇒ z = 2.75
It mean that values have score 2.75 standard deviations above the mean.